You may debug this issue by enabling WP_DEBUG from wp-config.php file and share us the response of it.
More precisely as per the error you may do the following:
Also, find the plugin that is causing the problem. by deactivating all of them one by one.
when you find the culprit
go to your root folder >wp-content>plugins> the culprit plugin open the Plugin php file with an editor, Notepad ++
look for “add_options_page” in my case you will see in the same line
add_options_page(“Popular Tags Options”, “Popular Tags”, 8, basename(__FILE__), “ads_admin_page_inc”);
remove the “8” and put 'activate_plugins'
so it will be
add_options_page(“Popular Tags Options”, “Popular Tags”, ‘activate_plugins’, basename(__FILE__), “ads_admin_page_inc”);
with single colon
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